Vibrator



March A:n ,-1924, 4f mama@ P. w. GATES VIBRATOR Filed Jan. 4, 1919 INVENTOR ATTRNEYS Patented Mar. l1, 1924.

@PHILnrUsjw earns, ror c'HIcaGo, vILLINOIS, Assia-Non rro 'MUMroan-Monnme -fMAcHrNE GoMrAlvr, a CORPORATION or 'NEW JERSEY.

VIBRATOR.

.Application `tiled. January 4,' 1919. Serial No. 269,582.

To all whom t may concern:

Be it known that I, Prrnnrrcs W. GATES,

a `citizen of the'United States, lresiding at Chicago, in the county of Cook and State of Illinois,ihave Ainvented certain new and useful Improvements in Vibrators, of which the following is a specification.

This invention relates to improvements in vibrators, and has for its object to provide a vibrator especially adapted for use with molding machines or in molding operations. Its principal object is to provide a vibrator in which the action is unbalanced, that is, the impact of one stroke of the vibrator piston is less than the impact of the other. These and other objects will be more fully set forth in the following specification and shown in the accompanying drawing in which- 10 designates a cylinder internally threaded at each end. To these threaded ends are screwed the plug 10 and cap 10b, the latter being provided with a iiange 10 for attachment to the mechanism to be vibrated. The

cylinder is provided with a relatively large inlet duct 10d, in which is threaded a supply pipe A for operating fluid. The cylinder is also provided with exhaust ports 10e and 10", and with internal recesses 10Ig and 10h adjacent the respective ends of the cylinder,

as shown in the drawing.

Reciprocably mounted and closely fitting in the cylinder is the piston 12 provided with a central duct 12, enlarged to constitute in effect a reservoir.

at its open end by means of the screw plug 12". A central peripheral groove 12 is provided on the piston 12, this groove being so located as to be in constant communication i0 with the inlet duct 10d of the cylinder. A cross communicating duct 12 extends from the central duct 12a to the groove 12. Peripheral grooves 12f and 12g are provided on the piston 12 adjacent the ends thereof, and

c5 cross ducts 12h and 12i lead from the central duct to the grooves 12f and 12g, respectively. The duct 12h is relatively considerably smaller than the duct 12, for a purpose to be hereinafter described. The piston is further co provided with the impact bosses 12k and 12m, the former being smaller, and a spring 14 extends around the boss 121,i and between the corresponding end of cylinder 12 and cap 10b. Tn the 'operation of the vibrator air, being This duct is closed 'supplied through pipe A and duct 10d to the interior of the cylinder, flows around the piston groove 12, and from thence through the cross duct 12e to the central or interiorly located duct 12a, from whence, when the piston .is in the position shown, it flows via the duct 12i to the groove 12g, this duct being in communication with the recess 10h. They operating fluid flows into the right hand end of the cylinder and operates to force the piston rapidly in the opposite direction against the action of the springle until the boss 12k impacts against the end of the cap. Prior to such impact the groove 12g moves out of communication with the recess, cutting off the supply of air to that end of the cylinder. Admission of actuating fluid to the other end of the cylinder, however, begins through communication of groove 12f with recess 10g, fluid being conveyed to said groove through the relatively small cross duct 12h. Prior to the beginning of the return movement exhaust of air through the port 10t takes place. The return stroke takes place as the result of the admission of air to this end of the cylinder, and is enhanced by the action of the spring 14. This spring is of suilicient strength to maintain the piston 12 normally in the position shown in the drawing, so as to be ready for an impact stroke upon admitting the supply of operating fluid and to prevent the piston stalling or lying in dead center.

My invention consists in the provision of the relatively small cross duct 12h, which functions to supply less air for the movement of the piston from left to right, as viewed in the drawing, whereby the impact of the piston against the right hand plug 1()a is considerably less than the impact against the left hand cap 10b. The object of this operation is to imbalance the vibrator, since the piston in this vibrator, travelling at a speed of several thousand vibrations per minute, tends to counterbalance or neutralize the impacts when of equal force. This is also assisted by the time required to overcome the inertia of the mechanism to which it is attached. By my construction one of the two impacts of each cycle is considerably greater than the other, so that there is an unbalanced vibration, as it is termed. The other novel features of the vibrator are set forti?. @11d covered in I do not wish to be restricted to the form of my invention shown in the accompanying drawings and described in the foregoing specification, except as dened in the appended claims.

What I claim is:

l. A vibrator comprising a cylinder closed at the ends, a piston reciprocably mounted therein to impact at the ends of vsaid cylinder, said piston being provided with an interiorly located duct, said cylinder being provided with a fluid supply inlet, means tomaintain constant communica.- tion between said inlet and said duct, and

ducts leading from said first-named duct to the respective ends of said cylinder, one of said second-named ducts being relatively larger than the other.

2. A vibrator comprising a cylinder closed at the ends and having a iuid supply inlet, a piston reciprocable therein to impact at each end of said cylinder, said piston being provided with an interiorly located duct in V'constant communication with said inlet, and a duct at each end of said first-named duct communicating with the respective end of said cylinder, one of said ducts being relatively larger than the other.

In testimony whereof, I have subscribedV my name. Y

PHILE'IUS GATES. 

